We're on baby bump watch!

Vanessa Lachey shared a snapshot of her blossoming belly on Instagram Tuesday -- her first photo since her second pregnancy announcement.

"STOP! HAMMER TIME!!!" she wrote, along with a picture of herself striking an MC Hammer pose while she danced in a flowing harem pants jumpsuit. "@jennblee made me buy this outfit and I have to say, I'm pretty comfortable!"

Vanessa's hubby Nick Lachey took to Twitter on July 15 to confirm that the couple is expecting their second child together, a baby girl.

The 98 Degrees singer shared a photo on the beach with "It's a girl" written in the sand, and captioned the shot, "Can't think of a better way to celebrate 3 years of marriage to my beautiful @VanessaLachey than this! #family." 

The former Miss Teen USA winner spoke previously about her intentions to give her son Camden, 2, a sibling close in age. "You don't want them so far apart that they have nothing in common," she told Parents magazine earlier this year.

But, she's not the only mama-to-be who's showing off her bump!

Alyssa Milano put her growing belly on display to promote her book, "Hacktivist," at Barnes & Noble Tribeca in New York City on Tuesday.

The 41-year-old beauty looked chic and sophisticated in red embroidered tee, black leather skinnies and black strappy stilettos. 

The actress recently revealed the gender of her baby in a sweet message on her website.

"Hello, lovely people. I’m in my 'Mistresses' dressing room and I wanted to share with you guys that I am expecting a little sweet baby girl," she said in a cute clip. "And David, Milo and I could not be happier. Truly, we could not be happier. So exciting!"

Milano and her hubby David Bugliari are already parents to son Milo, who was born Aug. 31, 2011.

What do you think of Vanessa and Alyssa's maternity style? Tell toofab in the comment section below, and click "Launch Gallery" above to see more expecting celebs.

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